i am currently running my russion muff into my modified DS-1, I like the sound.
i do rotate my pedals and a number of my fuzzes into the DS-1 has a good sound!!! i keep the DS-1 on the bassy side (tone at like 10 o'clock)
I've been running fuzzes into drives and vice versa for awhile now, kinda late to the stacking pedals game, but it's been pretty fun seeing the combinations that work well together. A DOD 250 into another OD pedal has been rocking my world as of late, still have to try that into a fuzz.
At my last band practice, I ran an EHX Green Russian RI into a DOD Gunslinger. That seemed to ignite the rest of the band and push the energy up a notch.